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Environmental fate & pathways

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Adsorption / desorption

The adsorption coefficient Koc in soil and in sewage sludge Ethyl 2-naphthyl ether (CAS No.93 -18 -5) was determined by the Reverse Phase High Performance Liquid Chromatographic method according to OECD Guideline No. 121 for testing of Chemicals (Experimental study report, 2018). The solutions of the test substance and reference substances were prepared in appropriate solvents. A test item solution was prepared by accurately weighing 4 mg of test item and diluted with ACN up to10ml. Thus, the test solution concentration was 400 mg/l. The pH of test substance was 6.23. Each of the reference substance and test substance were analysed by HPLC at 210 nm. After equilibration of the HPLC system, Urea was injected first, the reference substances were injected in duplicate, followed by the test chemical solution in duplicate. Reference substances were injected again after test sample, no change in retention time of reference substances was observed. Retention time tR were measured, averaged and the decimal logarithms of the capacity factors k were calculated. The graph was plotted between log Koc versus log k(Annex - 2).The linear regression parameter of the relationship log Koc vs log k were also calculated from the data obtained with calibration samples and therewith, log Koc of the test substance was determined from its measured capacity factor. The reference substances were chosen according to estimated Koc range of the test substance and generalized calibration graph was prepared or chosen according to functionalyl similarity with the test substance and calibration graph prepared. The reference substances were Xylene, Ethylbenzene, Toluene, Naphthalene, phenanthrene having Koc value ranging from 2.369 to 4.09 The Log Koc value of test substance Ethyl 2-naphthyl ether was determined to be 3.490 ± 0.003 at 25°C. This log Koc value indicates that the substance Ethyl 2-naphthyl ether has a strong sorption to soil and sediment and therefore have negligible to slow migration potential to ground water.

Additional information

Adsorption / desorption

The adsorption coefficient Koc in soil and in sewage sludge Ethyl 2-naphthyl ether (CAS No.93 -18 -5) was determined by the Reverse Phase High Performance Liquid Chromatographic method according to OECD Guideline No. 121 for testing of Chemicals (Experimental study report, 2018). The solutions of the test substance and reference substances were prepared in appropriate solvents. A test item solution was prepared by accurately weighing 4 mg of test item and diluted with ACN up to10ml. Thus, the test solution concentration was 400 mg/l. The pH of test substance was 6.23. Each of the reference substance and test substance were analysed by HPLC at 210 nm. After equilibration of the HPLC system, Urea was injected first, the reference substances were injected in duplicate, followed by the test chemical solution in duplicate. Reference substances were injected again after test sample, no change in retention time of reference substances was observed. Retention time tR were measured, averaged and the decimal logarithms of the capacity factors k were calculated. The graph was plotted between log Koc versus log k(Annex - 2).The linear regression parameter of the relationship log Koc vs log k were also calculated from the data obtained with calibration samples and therewith, log Koc of the test substance was determined from its measured capacity factor. The reference substances were chosen according to estimated Koc range of the test substance and generalized calibration graph was prepared or chosen according to functionalyl similarity with the test substance and calibration graph prepared. The reference substances were Xylene, Ethylbenzene, Toluene, Naphthalene, phenanthrene having Koc value ranging from 2.369 to 4.09 The Log Koc value of test substance Ethyl 2-naphthyl ether was determined to be 3.490 ± 0.003 at 25°C. This log Koc value indicates that the substance Ethyl 2-naphthyl ether has a strong sorption to soil and sediment and therefore have negligible to slow migration potential to ground water.